cdk-monitoring-constructs
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JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.ScaleAlarms = void 0;
const aws_cdk_lib_1 = require("aws-cdk-lib");
const aws_cloudwatch_1 = require("aws-cdk-lib/aws-cloudwatch");
const SupportedMetricPeriods = [
aws_cdk_lib_1.Duration.minutes(1),
aws_cdk_lib_1.Duration.minutes(5),
aws_cdk_lib_1.Duration.minutes(15),
aws_cdk_lib_1.Duration.hours(1),
aws_cdk_lib_1.Duration.hours(6),
aws_cdk_lib_1.Duration.days(1),
aws_cdk_lib_1.Duration.days(7),
];
/**
* Creates a function that clones alarms to be more scaled using the multiplication factors
* provided. This function can be provided to the `cloneAlarms` method of
* {@link MonitoringFacade}.
*
* This can be used with scaling factors less than 1.0 to create more aggressive alarms, which
* can be useful to provide early detection and trigger change rollbacks.
*
* If the datapoints to alarm would be scaled to such a small number that it can't effectively be
* alarmed, the metric period will be reduced to the next smallest duration and the required
* datapoint count will scale up accordingly.
*
* @param props The properties for configuring the function.
* @returns A function that clones alarms and applies scaling factors.
*/
function ScaleAlarms(props) {
return function (alarm) {
let thresholdMultiplierToUse = 1;
if (props.thresholdMultiplier) {
const comparisonOperator = alarm.alarmDefinition.addAlarmProps.comparisonOperator;
switch (comparisonOperator) {
case aws_cloudwatch_1.ComparisonOperator.GREATER_THAN_OR_EQUAL_TO_THRESHOLD:
case aws_cloudwatch_1.ComparisonOperator.GREATER_THAN_THRESHOLD:
thresholdMultiplierToUse = props.thresholdMultiplier;
break;
case aws_cloudwatch_1.ComparisonOperator.LESS_THAN_OR_EQUAL_TO_THRESHOLD:
case aws_cloudwatch_1.ComparisonOperator.LESS_THAN_THRESHOLD:
thresholdMultiplierToUse = 1.0 / props.thresholdMultiplier;
break;
case aws_cloudwatch_1.ComparisonOperator.GREATER_THAN_UPPER_THRESHOLD:
case aws_cloudwatch_1.ComparisonOperator.LESS_THAN_LOWER_THRESHOLD:
case aws_cloudwatch_1.ComparisonOperator.LESS_THAN_LOWER_OR_GREATER_THAN_UPPER_THRESHOLD:
// Don't modify thresholds for anomaly detection models.
thresholdMultiplierToUse = 1;
break;
default:
throw new Error(`Comparison operator ${comparisonOperator} is not supported by ScaleAlarms.`);
}
}
let cloneThreshold = alarm.alarmDefinition.addAlarmProps.threshold * thresholdMultiplierToUse;
let cloneEvaluationPeriods = alarm.alarmDefinition.evaluationPeriods *
(props.evaluationPeriodsMultiplier ??
props.datapointsToAlarmMultiplier ??
1);
let cloneDatapointsToAlarm = alarm.alarmDefinition.datapointsToAlarm *
(props.datapointsToAlarmMultiplier ?? 1);
// If the tightened datapoints to alarm is now so small that we can't effectively alarm on it,
// reduce the metric period to the next smallest duration and scale up the datapoint count accordingly.
let clonePeriod = alarm.alarmDefinition.addAlarmProps.period;
if (cloneEvaluationPeriods < 2 || cloneDatapointsToAlarm < 2) {
const originalPeriod = alarm.alarmDefinition.addAlarmProps.period ??
alarm.alarmDefinition.metric.period;
const nextSmallestPeriod = findNextSmallestPeriod(originalPeriod);
if (nextSmallestPeriod) {
clonePeriod = nextSmallestPeriod;
const datapointScaleFactor = originalPeriod.toSeconds() / nextSmallestPeriod.toSeconds();
cloneEvaluationPeriods = cloneEvaluationPeriods * datapointScaleFactor;
cloneDatapointsToAlarm = cloneDatapointsToAlarm * datapointScaleFactor;
// If the metric uses SUM or N, we also need to scale the threshold down.
if ("statistic" in alarm.alarmDefinition.metric) {
if (alarm.alarmDefinition.metric.statistic === aws_cloudwatch_1.Stats.SUM ||
alarm.alarmDefinition.metric.statistic === aws_cloudwatch_1.Stats.SAMPLE_COUNT) {
cloneThreshold = cloneThreshold / datapointScaleFactor;
}
}
}
}
cloneEvaluationPeriods = Math.max(1, Math.round(cloneEvaluationPeriods));
cloneDatapointsToAlarm = Math.max(1, Math.round(cloneDatapointsToAlarm));
return {
...alarm.alarmDefinition.addAlarmProps,
disambiguator: props.disambiguator,
threshold: cloneThreshold,
evaluationPeriods: cloneEvaluationPeriods,
datapointsToAlarm: cloneDatapointsToAlarm,
period: clonePeriod,
};
};
}
exports.ScaleAlarms = ScaleAlarms;
function findNextSmallestPeriod(originalPeriod) {
for (let index = SupportedMetricPeriods.length - 1; index >= 0; index--) {
const current = SupportedMetricPeriods[index];
if (current.toSeconds() < originalPeriod.toSeconds()) {
return current;
}
}
return undefined;
}
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In this case,\n   * the `datapointsToAlarm` and `evaluationPeriods` are increased by the same factor that the\n   * period is decreased. It will also scale `threshold` for metrics using the SUM or SAMPLE_COUNT\n   * stats.\n   *\n   * @default - 1.0\n   */\n  readonly datapointsToAlarmMultiplier?: number;\n\n  /**\n   * A multiplication factor to apply to the `evaluationPeriods` property of the cloned alarms.\n   * @default - Same as datapointsToAlarmMultiplier.\n   */\n  readonly evaluationPeriodsMultiplier?: number;\n}\n\n/**\n * Creates a function that clones alarms to be more scaled using the multiplication factors\n * provided. This function can be provided to the `cloneAlarms` method of\n * {@link MonitoringFacade}.\n *\n * This can be used with scaling factors less than 1.0 to create more aggressive alarms, which\n * can be useful to provide early detection and trigger change rollbacks.\n *\n * If the datapoints to alarm would be scaled to such a small number that it can't effectively be\n * alarmed, the metric period will be reduced to the next smallest duration and the required\n * datapoint count will scale up accordingly.\n *\n * @param props The properties for configuring the function.\n * @returns A function that clones alarms and applies scaling factors.\n */\nexport function ScaleAlarms(props: ScaleAlarmsProps): AlarmCloneFunction {\n  return function (alarm: AlarmWithAnnotation) {\n    let thresholdMultiplierToUse: number = 1;\n    if (props.thresholdMultiplier) {\n      const comparisonOperator =\n        alarm.alarmDefinition.addAlarmProps.comparisonOperator;\n      switch (comparisonOperator) {\n        case ComparisonOperator.GREATER_THAN_OR_EQUAL_TO_THRESHOLD:\n        case ComparisonOperator.GREATER_THAN_THRESHOLD:\n          thresholdMultiplierToUse = props.thresholdMultiplier;\n          break;\n        case ComparisonOperator.LESS_THAN_OR_EQUAL_TO_THRESHOLD:\n        case ComparisonOperator.LESS_THAN_THRESHOLD:\n          thresholdMultiplierToUse = 1.0 / props.thresholdMultiplier;\n          break;\n        case ComparisonOperator.GREATER_THAN_UPPER_THRESHOLD:\n        case ComparisonOperator.LESS_THAN_LOWER_THRESHOLD:\n        case ComparisonOperator.LESS_THAN_LOWER_OR_GREATER_THAN_UPPER_THRESHOLD:\n          // Don't modify thresholds for anomaly detection models.\n          thresholdMultiplierToUse = 1;\n          break;\n        default:\n          throw new Error(\n            `Comparison operator ${comparisonOperator} is not supported by ScaleAlarms.`,\n          );\n      }\n    }\n    let cloneThreshold =\n      alarm.alarmDefinition.addAlarmProps.threshold * thresholdMultiplierToUse;\n\n    let cloneEvaluationPeriods =\n      alarm.alarmDefinition.evaluationPeriods *\n      (props.evaluationPeriodsMultiplier ??\n        props.datapointsToAlarmMultiplier ??\n        1);\n    let cloneDatapointsToAlarm =\n      alarm.alarmDefinition.datapointsToAlarm *\n      (props.datapointsToAlarmMultiplier ?? 1);\n\n    // If the tightened datapoints to alarm is now so small that we can't effectively alarm on it,\n    // reduce the metric period to the next smallest duration and scale up the datapoint count accordingly.\n    let clonePeriod = alarm.alarmDefinition.addAlarmProps.period;\n    if (cloneEvaluationPeriods < 2 || cloneDatapointsToAlarm < 2) {\n      const originalPeriod =\n        alarm.alarmDefinition.addAlarmProps.period ??\n        alarm.alarmDefinition.metric.period;\n\n      const nextSmallestPeriod = findNextSmallestPeriod(originalPeriod);\n      if (nextSmallestPeriod) {\n        clonePeriod = nextSmallestPeriod;\n        const datapointScaleFactor =\n          originalPeriod.toSeconds() / nextSmallestPeriod.toSeconds();\n        cloneEvaluationPeriods = cloneEvaluationPeriods * datapointScaleFactor;\n        cloneDatapointsToAlarm = cloneDatapointsToAlarm * datapointScaleFactor;\n\n        // If the metric uses SUM or N, we also need to scale the threshold down.\n        if (\"statistic\" in alarm.alarmDefinition.metric) {\n          if (\n            alarm.alarmDefinition.metric.statistic === Stats.SUM ||\n            alarm.alarmDefinition.metric.statistic === Stats.SAMPLE_COUNT\n          ) {\n            cloneThreshold = cloneThreshold / datapointScaleFactor;\n          }\n        }\n      }\n    }\n\n    cloneEvaluationPeriods = Math.max(1, Math.round(cloneEvaluationPeriods));\n    cloneDatapointsToAlarm = Math.max(1, Math.round(cloneDatapointsToAlarm));\n\n    return {\n      ...alarm.alarmDefinition.addAlarmProps,\n      disambiguator: props.disambiguator,\n      threshold: cloneThreshold,\n      evaluationPeriods: cloneEvaluationPeriods,\n      datapointsToAlarm: cloneDatapointsToAlarm,\n      period: clonePeriod,\n    };\n  };\n}\n\nfunction findNextSmallestPeriod(originalPeriod: Duration) {\n  for (let index = SupportedMetricPeriods.length - 1; index >= 0; index--) {\n    const current = SupportedMetricPeriods[index];\n    if (current.toSeconds() < originalPeriod.toSeconds()) {\n      return current;\n    }\n  }\n  return undefined;\n}\n"]}